JP2008141879A - Fuel cell vehicle control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To charge and discharge a power storing means to control direct-current voltage and thereby control the output of a fuel cell and omit an output adjusting means for the fuel cell to reduce the size and weight of equipment, maintenance work, and cost. <P>SOLUTION: A fuel cell vehicle control device includes: a fuel cell 1; a power storing means 3 for storing power; a charger-discharger 4 for charging and discharging the power storing means; a direct-current capacitor 5 that smooths the direct-current power of the fuel cell and the direct-current power of the charger-discharger; an inverter 6 that converts the direct-current power of the fuel cell and the direct-current power of the charger-discharger into alternating-current power; a motor 7 driven by alternating-current power, or the output of the inverter as the result of conversion; a direct-current voltage detecting means 8 for detecting the terminal voltage of the direct-current capacitor; and a charge/discharge controlling means 9 that controls the charger-discharger so that the terminal voltage of the direct-current capacitor, detected by the direct-current voltage detecting means, is kept within a certain voltage range. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell vehicle control device.

  As a conventional fuel cell vehicle control device, one described in Japanese Patent Application Laid-Open No. 2004-282859 (Patent Document 1) has a direct current power generation means having a fuel cell and an output adjustment means, and the direct current power generation means generates. DC power generation comprising an inverter for converting DC power to AC power, power storage means having a function of charging and discharging DC power, control means for controlling each of these means, and a motor for driving a railway vehicle The DC power supplied to the inverter is controlled by the means and the power storage means to perform power sharing control in accordance with the characteristics of the fuel cell and the power storage means.

By the way, the output characteristic of the fuel cell has a drooping characteristic in which the terminal voltage decreases as the output current increases. Conversely, when the terminal voltage of the fuel cell is determined, only the output current flows according to the terminal voltage. Therefore, if the terminal voltage of the fuel cell can be controlled, the output power of the fuel cell can be controlled. Therefore, if the fuel cell output terminal and the DC voltage are directly connected, and the DC voltage is controlled by charging and discharging the DC power by the power storage means, the fuel cell output adjusting means can be omitted even if the fuel cell output adjusting means is omitted. The output power can be controlled.
JP 2004-282859 A

  The present invention has been made in view of such a technical background, and controls the output of the fuel cell by controlling the DC voltage by the power storage means, and omits the output adjustment means of the fuel cell, thereby reducing the size of the apparatus. An object of the present invention is to provide a fuel cell vehicle control device that can be reduced in weight, reduced maintenance, and reduced in cost.

  One feature of the present invention is that power generation means using a fuel cell, power storage means for accumulating electric power, a charge / discharge device for charging / discharging the power storage means, DC power of the fuel cell, and DC power of the charge / discharge device A DC capacitor for smoothing, an inverter for converting the DC power of the fuel cell and the DC power of the charging / discharging device into AC power, a motor driven by AC power that is a conversion output of the inverter, and the DC DC voltage detection means for detecting the terminal voltage of the capacitor, and charge / discharge control means for controlling the charge / discharge device so as to maintain the terminal voltage of the DC capacitor detected by the DC voltage detection means within a certain voltage range. A fuel cell vehicle control device provided.

  Other features of the present invention are: power generation means using a fuel cell; power storage means for storing power; charge / discharge device for charging / discharging the power storage means; direct current power for the fuel cell; and direct current power for the charge / discharge device. A DC capacitor for smoothing, an inverter for converting the DC power of the fuel cell and the DC power of the charging / discharging device into AC power, a motor driven by AC power that is a conversion output of the inverter, and the DC DC voltage detection means for detecting a terminal voltage of the capacitor, and charge / discharge control means for controlling the charge / discharge device so as to maintain the terminal voltage of the DC capacitor detected by the DC voltage detection means at a constant voltage. It is a fuel cell vehicle control device.

  Another feature of the present invention is that power generation means using a fuel cell, power storage means for storing electric power, a charge / discharge device for charging / discharging the power storage means, DC power of the fuel cell, and direct current of the charge / discharge device A DC capacitor for smoothing the power, an inverter for converting the DC power of the fuel cell and the DC power of the charging / discharging device into AC power, a motor driven by AC power that is a conversion output of the inverter, and DC voltage detection means for detecting the terminal voltage of the DC capacitor, and charge / discharge control means for controlling the charge / discharge device so that the terminal voltage of the DC capacitor detected by the DC voltage detection means does not fall below a lower limit set voltage. A fuel cell vehicle control device provided.

  Still another feature of the present invention is that power generation means using a fuel cell, power storage means for storing power, charge / discharge device for charging / discharging the power storage means, direct current power of the fuel cell and direct current of the charge / discharge device A DC capacitor for smoothing power, an inverter that converts DC power of the fuel cell and DC power of the charging / discharging device into AC power, a motor driven by AC power that is a conversion output of the inverter, DC voltage detection means for detecting a terminal voltage of the DC capacitor, and charge / discharge control means for controlling the charge / discharge device so that the terminal voltage of the DC capacitor detected by the DC voltage detection means does not exceed an upper limit set voltage. Is a fuel cell vehicle control device.

  According to the fuel cell vehicle control device of the present invention, the output of the fuel cell can be controlled by controlling the DC voltage with the power storage means, and as a result, the output adjustment means of the fuel cell can be omitted. This makes it possible to reduce the size and weight of the equipment, reduce maintenance, and reduce costs.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) FIG. 1 shows the configuration of a fuel cell vehicle control device according to a first embodiment of the present invention. The fuel cell vehicle control device of the present embodiment includes a fuel cell 1, A diode 2 for the fuel cell 1, a power storage device 3 for storing power, a charge / discharge device 4 for charging and discharging the power storage device 3, a DC capacitor 5, an inverter 6 for converting DC power into AC power, and this inverter From the motor 7 driven by the AC power that is the conversion output 6, the DC voltage detector 8 that detects the terminal voltage of the DC capacitor 5, and the charge / discharge control device 9 that controls the charge / discharge operation of the charge / discharge device 4. It is configured.

  The output terminal of the fuel cell 1 is connected to a DC capacitor 5 via a diode 2. The diode 2 is a reverse current prevention diode that prevents current from flowing from the DC capacitor 5 to the fuel cell 1 when the output voltage of the fuel cell 1 is lower than the DC voltage of the DC capacitor 5. The power storage device 3 is connected to the DC capacitor 5 via the charging / discharging device 4, and the charging / discharging device 4 charges or discharges the power storage device 3 to control the DC power. The DC capacitor 5 is connected to the DC terminal of the inverter 6, and the AC terminal of the inverter 6 is connected to the motor 7. The inverter 6 orthogonally transforms the DC power to output variable AC power, and drives the motor 7 with this AC power. The DC voltage detector 8 measures the terminal voltage of the DC capacitor 5 and outputs the detection signal to the charge / discharge control device 9. The voltage detection signal of the DC voltage detector 8 serves as a control command for the charging / discharging device 4 for controlling the terminal voltage of the DC capacitor 5.

  FIG. 2 shows an example of output characteristics of the fuel cell. The horizontal axis represents current i, and the vertical axis represents voltage v and power p with respect to current i. Assuming that the voltage v is a voltage at which the current i of the fuel cell is zero and the maximum voltage is 1 pu, the voltage v decreases as the current increases, and the voltage becomes 0.5 pu when the current is a maximum of 1 pu. At this time, the power p can be calculated from the product of the current i and the voltage v. If the point at which the power is maximum is 1 pu, the characteristic curve of the power p is as shown in FIG.

  If the characteristic curve of FIG. 2 is converted into a graph with power p on the horizontal axis and voltage v on the vertical axis, the characteristic curve as shown in FIG. 3 is obtained. It can be seen from FIG. 3 that when the power p of the fuel cell 1 is determined, the voltage v of the fuel cell output terminal is determined, and conversely, when the voltage v is determined, the power p that is the output of the fuel cell is determined.

  FIG. 4 shows a fuel cell characteristic curve when the DC voltage is adjusted by the charging / discharging device 4 so that the terminal voltage of the DC capacitor 5 falls within a certain voltage range. Since the fuel cell 1 generates only the electric power p corresponding to the voltage v of the output terminal, the charging / discharging device 4 charges the power storage device 3 when the terminal voltage of the DC capacitor 5 and the fuel cell output voltage are likely to be out of a certain voltage range. Alternatively, the terminal voltage of the DC capacitor 5 is maintained within a certain voltage range by discharging and compensating for the excess and deficiency of the fuel cell output.

  Specifically, when the power consumption in the inverter 6 is reduced and the output of the fuel cell 1 is reduced, the output terminal voltage of the fuel cell 1 is likely to exceed a certain voltage range. At this time, the charging / discharging control device 9 determines that the output terminal voltage of the fuel cell 1 is increased by the terminal voltage of the DC capacitor 5 and exceeds a certain voltage range, and the charging / discharging device 4 charges the power storage device 3 with DC power. The output power voltage of the fuel cell 1 is kept within a certain voltage range while suppressing a decrease in the generated power of the fuel cell 1. On the contrary, when the power consumption in the inverter 6 increases and the output of the fuel cell 1 increases, the output terminal voltage of the fuel cell 1 tends to decrease and fall below a certain voltage range. At this time, the charge / discharge control device 9 determines that the output terminal voltage of the fuel cell 1 decreases and falls below a certain voltage range, and the charge / discharge device 4 discharges DC power from the power storage device 3. An increase in generated power is suppressed and the output terminal voltage of the fuel cell 1 is maintained within a certain voltage range.

  As described above, in the fuel cell vehicle control device of the present embodiment, the charge / discharge control device 9 controls the charge / discharge operation of the charge / discharge device 4 so that the terminal voltage of the DC capacitor 5 falls within a certain voltage range, thereby controlling the DC voltage. Thus, even if there is no output adjusting means in the fuel cell 1, the output power can be adjusted within a certain range, and power sharing control can be performed in which excess and deficient power is shared by the power storage device 3. Therefore, according to the present embodiment, it is possible to reduce the size and weight of the apparatus, reduce maintenance, and reduce the cost.

  (Second Embodiment) A fuel cell vehicle control apparatus according to a second embodiment of the present invention will be described with reference to FIG. Note that the configuration of the present embodiment is the same as that of the first embodiment and is shown in FIG.

  FIG. 5 is a fuel cell characteristic curve when the DC voltage is adjusted by the charging / discharging device 4 so that the terminal voltage of the DC capacitor 5 becomes a constant voltage. The fuel cell 1 generates only electric power p corresponding to the voltage v at the output terminal. Therefore, the charge / discharge control device 9 causes the charge / discharge device 4 to charge or discharge the difference power between the power required by the inverter 6 and the power p generated by the fuel cell 1, thereby discharging excess / deficient power. Adjust so that it is shared by 3.

  Specifically, the charging / discharging control of the charging / discharging device 4 so that the terminal voltage of the DC capacitor 5 becomes constant by the charging / discharging control device 9, the output terminal voltage of the fuel cell 1 is always controlled by the controlled voltage. It has become. Therefore, when the power consumption in the inverter 6 increases or decreases, the output power of the fuel cell 1 is set to a constant output by charging / discharging the fluctuation power for the DC power from the power storage device 3 to the charge / discharge device 4. The output terminal voltage of the fuel cell 1 is maintained at a set voltage.

  As described above, in the fuel cell vehicle control device according to the present embodiment, the DC voltage is adjusted by the charging / discharging device 4 so that the DC capacitor voltage becomes a constant voltage. Power sharing control can be performed in which output power is adjusted and excess or deficient power is shared by the power storage device 3. Therefore, according to the present embodiment, it is possible to reduce the size and weight of the apparatus, reduce maintenance, and reduce the cost.

  (Third Embodiment) A fuel cell vehicle control apparatus according to a third embodiment of the present invention will be described with reference to FIG. Note that the configuration of the present embodiment is the same as that of the first embodiment and is shown in FIG.

  FIG. 6 is a fuel cell characteristic curve when the DC voltage is adjusted by the charging / discharging device 4 so that the terminal voltage of the DC capacitor 5 does not fall below the lower limit set voltage. In the charge / discharge control device 9, the power consumption of the inverter 6 is small, and when the terminal voltage of the DC capacitor 5 is not lower than the lower limit set voltage, the charge / discharge device 4 is kept stopped, and the power consumption of the inverter 6 increases. When the terminal voltage of the DC capacitor 5 becomes equal to or lower than the lower limit setting voltage, the charging / discharging device 4 is controlled to discharge from the power storage device 3 and maintain the terminal voltage at the lower limit setting voltage.

  As a result, according to the present embodiment, the direct-current voltage can be controlled so that the terminal voltage of the direct-current capacitor 5 does not become the lower limit set voltage or less, and the fuel cell output can be protected from excessive output.

  (Fourth Embodiment) A fuel cell vehicle control apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. Note that the configuration of the present embodiment is the same as that of the first embodiment and is shown in FIG.

  FIG. 7 is a fuel cell characteristic curve when the DC voltage is adjusted by the charging / discharging device 4 so that the terminal voltage of the DC capacitor 5 does not exceed the upper limit set voltage. The charging / discharging control device 9 keeps the charging / discharging device 4 stopped when the power consumption of the inverter 6 is large to some extent and the terminal voltage of the DC capacitor 5 is not equal to or higher than the upper limit setting voltage, and the power consumption of the inverter 6 is reduced. When the terminal voltage of the DC capacitor 5 becomes equal to or higher than the upper limit set voltage, the charging / discharging device 4 controls the power storage device 3 to charge and store the DC power.

  As a result, according to the present embodiment, the DC voltage is controlled so that the terminal voltage of the DC capacitor 5 does not exceed the upper limit set voltage, so that the fuel cell 1 can be efficiently generated while avoiding the low output operation. Can be made.

  (Fifth Embodiment) A fuel cell vehicle control apparatus according to a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 8 shows the configuration of the fuel cell vehicle control device of the present embodiment. In this embodiment, the rotational speed of the motor 7 is detected with respect to the configuration of the first embodiment shown in FIG. The speed detector 10 is additionally provided to output a detection speed signal of the speed detector 10 to the charge / discharge control device 9, and the charge / discharge control device 9 is based on the detected speed together with the terminal voltage of the DC capacitor 5. The charging / discharging of the charging / discharging device 4 is controlled.

  FIG. 9 shows an example of a conversion function for generating a DC capacitor voltage command value from the detected speed signal obtained from the speed detector 10.

  In the present embodiment, the charging / discharging control device 9 controls the charging / discharging operation of the charging / discharging device 4 so that the DC capacitor voltage is based on the conversion function of FIG. In FIG. 9, the fuel cell power generation is reduced by increasing the DC capacitor voltage when the detection speed is low, the fuel cell power generation is increased as the speed increases when the speed is medium, and the fuel cell is increased when the speed is high. 1 is the maximum output. By adjusting the generated power of the fuel cell 1 according to the motor speed (vehicle speed) in this way, the generated power of the fuel cell can be increased in accordance with the power consumption of the motor that increases with the speed. Thus, according to the present embodiment, the power generated by the fuel cell 1 can be set to an optimum power value in accordance with the speed of the vehicle, and the fuel cell 1 can be operated efficiently.

  (Sixth Embodiment) A sixth embodiment of the present invention will be described with reference to FIG. FIG. 10 shows the configuration of the fuel cell vehicle control device according to the present embodiment. In this embodiment, a travel plan holding unit 11 is added to the configuration of the first embodiment shown in FIG. The charge / discharge control device 9 receives the travel plan information from the travel plan holding unit 11 and controls charging / discharging of the charge / discharge device 4 based on the travel plan information together with the terminal voltage of the DC capacitor 5. It is characterized by that.

  The travel plan holding unit 11 stores information such as a travel route, a gradient, a curve, a travel schedule, a travel time, and a stop time as travel plan information, and the charge / discharge control device 9 performs power information or energy based on the travel plan information. Information is calculated, the voltage command value for the terminal voltage of the DC capacitor 5 is adjusted so that the output of the fuel cell 1 is optimized based on the power information or energy information, and charging / discharging of the charging / discharging device 4 is controlled.

  Thereby, in this Embodiment, the electric power generation of the fuel cell 1 can be made into an optimal electric power value from the travel plan calculated beforehand, and a fuel cell can be drive | operated efficiently.

  (Seventh Embodiment) A fuel cell vehicle control apparatus according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 shows the configuration of the fuel cell vehicle control device of the present embodiment. In the present embodiment, the remaining amount of energy for the power storage device 3 is different from the configuration of the first embodiment shown in FIG. A detector 12 is additionally provided.

  This remaining energy detector 12 calculates the remaining energy by integrating the charge / discharge current of the power storage device 3 or measuring the terminal voltage of the power storage device 3. When the remaining energy of the power storage device 3 is full, the power storage device 3 cannot be charged any more. Therefore, the charge / discharge device 4 increases the DC capacitor voltage to reduce the amount of power generated by the fuel cell 1. 3 is controlled to discharge mainly. In addition, when the remaining amount of energy of the power storage device 3 is empty, the power storage device 3 cannot discharge any more. Therefore, the charging / discharging device 4 reduces the DC capacitor voltage to increase the power generation amount of the fuel cell 1 to store the power. Control to charge the device 3.

  As a result, according to the present embodiment, it is possible to control the generated power of the fuel cell 1 in consideration of the remaining energy of the power storage device 3 and to efficiently operate as a power supply system including the fuel cell 1 and the power storage device 3. be able to.

  (Eighth Embodiment) A fuel cell vehicle control apparatus according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 12 shows the configuration of the fuel cell vehicle control apparatus according to the present embodiment. In this embodiment, the power generation characteristic detection for the fuel cell 1 is detected with respect to the configuration of the first embodiment shown in FIG. A device 13 is additionally provided.

  This power generation characteristic detector 13 detects the voltage, current, temperature, and various signals from the fuel cell control circuit of the fuel cell 1 as power generation means. For example, the fuel cell 1 has a slow response to the generated power with respect to the sudden load fluctuation of the motor 7, and if the fuel supply is insufficient, the cell body in the fuel cell 1 may be damaged. Therefore, when the load variation is larger than the allowable variation rate of the fuel cell 1, the DC voltage is adjusted by the charging / discharging device 4 to maintain the generated power variation of the fuel cell 1 within the allowable value variation range. Therefore, the power generation characteristic detector 13 detects the voltage, current, temperature, and various signals from the fuel cell control circuit of the fuel cell 1 and inputs them to the charge / discharge control device 9. When it is determined that the allowable fluctuation rate is greater than 1, the DC capacitor voltage is increased by the charge / discharge device 4 to reduce the amount of power generated by the fuel cell 1 and control to discharge mainly from the power storage device 3, or the charge / discharge device By controlling the power storage device 3 to charge at 4, the DC capacitor voltage is lowered and the power generation amount of the fuel cell 1 is increased.

  As a result, according to the present embodiment, the generated power can be controlled in accordance with the power generation characteristics of the fuel cell 1, and the fuel cell 1 can be operated efficiently without imposing a burden.

  (Ninth Embodiment) A fuel cell control apparatus according to a ninth embodiment of the present invention will be described with reference to FIG. FIG. 13 shows the configuration of the fuel cell vehicle control device of the present embodiment. In this embodiment, the characteristics of the motor 7 are detected with respect to the configuration of the first embodiment shown in FIG. A motor characteristic detector 14 is additionally provided.

  The motor characteristic detector 14 detects information such as the voltage, current, temperature, and rotation speed of the motor 7 and outputs the information to the charge / discharge control device 9. The motor characteristic detector 14 may be provided in the motor 7 or in the inverter 6. May be.

  In this embodiment, the motor characteristic detector 14 detects the characteristics of the motor 7, so that the charge / discharge control device 9 obtains the operation information of the motor 7, and the fuel cell 1 and the power storage according to the characteristics of the motor 7. The charging / discharging device 4 is controlled to distribute the output of the device 3.

  As a result, according to the present embodiment, the power distribution control of the fuel cell 1 and the power storage device 3 in accordance with the characteristics of the motor 1 can be performed, and the entire system including the fuel cell 1, the power storage device 3, and the motor 7 can be efficiently performed. You can drive.

  (Tenth Embodiment) A fuel cell control apparatus according to a tenth embodiment of the present invention will be described. The configuration of the fuel cell control device of the present embodiment is the same as that of the first embodiment shown in FIG. In the present embodiment, when the power generated by the fuel cell 1 is stopped, the charge / discharge control device 9 controls the charge / discharge device 4 so that the terminal voltage of the DC capacitor 5 is higher than the no-load voltage of the fuel cell 1. It is characterized by doing.

  Since the fuel cell 1 includes the diode 2 at the output terminal, when the high voltage is applied to the DC capacitor 5 by discharging from the power storage device 3 with the charge / discharge device 4, the fuel cell 1 is in a no-load state and power is generated. Stop. Therefore, when the power generation of the fuel cell 1 is stopped, the charge / discharge control device 9 applies a high voltage to the DC capacitor 5 by causing the charge / discharge device 4 to discharge from the power storage device 3 to keep the fuel cell 1 in a no-load state. The power generation is controlled to stop.

  Thereby, according to this Embodiment, the fuel cell 1 can be stopped, without comprising a complicated stop sequence, and the fuel cell 1 can be started and stopped efficiently. The stop control of the fuel cell 1 can also be employed when stopping the fuel cell 1 in the second to ninth embodiments.

The block diagram of the fuel cell vehicle control apparatus of the 1st-4th and 10th embodiment of this invention. The graph which shows the output current, voltage, and electric power characteristic of a fuel cell. The graph which shows the output electric power and voltage characteristic of a fuel cell. The graph which shows the output control curve of the fuel cell in the 1st Embodiment of this invention. The graph which shows the output control curve of the fuel cell in the 2nd Embodiment of this invention. The graph which shows the output control curve of the fuel cell in the 3rd Embodiment of this invention. The graph which shows the output control curve of the fuel cell in the 4th Embodiment of this invention. The block diagram of the fuel cell vehicle control apparatus of the 5th Embodiment of this invention. The graph which shows the conversion function of the speed and DC capacitor voltage in the 5th Embodiment of this invention. The block diagram of the fuel cell vehicle control apparatus of the 6th Embodiment of this invention. The block diagram of the fuel cell vehicle control apparatus of the 7th Embodiment of this invention. The block diagram of the fuel cell vehicle control apparatus of the 8th Embodiment of this invention. The block diagram of the fuel cell vehicle control apparatus of the 9th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Diode 3 Electric power storage apparatus 4 Charging / discharging apparatus 5 DC capacitor 6 Inverter 7 Motor 8 Voltage detector 9 Charging / discharging control apparatus 10 Speed detector 11 Travel plan holding | maintenance part 12 Remaining energy detector 13 Power generation characteristic detector 14 Motor Characteristic detector

Claims (10)

Power generation means using a fuel cell;
Power storage means for storing electric power;
A charge / discharge device for charging / discharging the power storage means;
A DC capacitor for smoothing the DC power of the fuel cell and the DC power of the charge / discharge device;
An inverter that converts the DC power of the fuel cell and the DC power of the charging / discharging device into AC power;
A motor driven by AC power that is the conversion output of the inverter;
DC voltage detecting means for detecting a terminal voltage of the DC capacitor;
A fuel cell vehicle control device comprising charge / discharge control means for controlling the charge / discharge device so as to maintain a terminal voltage of the DC capacitor detected by the DC voltage detection means within a certain voltage range. Power generation means using a fuel cell;
Power storage means for storing electric power;
A charge / discharge device for charging / discharging the power storage means;
A DC capacitor for smoothing the DC power of the fuel cell and the DC power of the charge / discharge device;
An inverter that converts the DC power of the fuel cell and the DC power of the charging / discharging device into AC power;
A motor driven by AC power that is the conversion output of the inverter;
DC voltage detecting means for detecting a terminal voltage of the DC capacitor;
A fuel cell vehicle control device comprising charge / discharge control means for controlling the charge / discharge device so as to maintain a terminal voltage of the DC capacitor detected by the DC voltage detection means at a constant voltage. Power generation means using a fuel cell;
Power storage means for storing electric power;
A charge / discharge device for charging / discharging the power storage means;
A DC capacitor for smoothing the DC power of the fuel cell and the DC power of the charge / discharge device;
An inverter that converts the DC power of the fuel cell and the DC power of the charging / discharging device into AC power;
A motor driven by AC power that is the conversion output of the inverter;
DC voltage detecting means for detecting a terminal voltage of the DC capacitor;
A fuel cell vehicle control device comprising charge / discharge control means for controlling the charge / discharge device so that a terminal voltage of the DC capacitor detected by the DC voltage detection means does not become a lower limit set voltage or less. Power generation means using a fuel cell;
Power storage means for storing electric power;
A charge / discharge device for charging / discharging the power storage means;
A DC capacitor for smoothing the DC power of the fuel cell and the DC power of the charge / discharge device;
An inverter that converts the DC power of the fuel cell and the DC power of the charging / discharging device into AC power;
A motor driven by AC power that is a conversion output of the inverter;
DC voltage detecting means for detecting a terminal voltage of the DC capacitor;
A fuel cell vehicle control device comprising charge / discharge control means for controlling the charge / discharge device so that a terminal voltage of the DC capacitor detected by the DC voltage detection means does not exceed an upper limit set voltage.   5. The fuel cell vehicle control device according to claim 1, wherein the charge / discharge control unit changes a terminal voltage of the DC capacitor based on a speed of the fuel cell vehicle.   5. The fuel cell vehicle control device according to claim 1, wherein the charge / discharge control means changes the terminal voltage of the DC capacitor based on a travel plan of the fuel cell vehicle calculated in advance. .   The fuel cell vehicle control device according to any one of claims 1 to 4, wherein the charge / discharge control means changes a terminal voltage of the DC capacitor in accordance with a remaining amount of energy of the power storage means.   5. The fuel cell vehicle control device according to claim 1, wherein the charge / discharge control means changes a terminal voltage of the DC capacitor according to a power generation characteristic of the power generation means.   The fuel cell vehicle control device according to any one of claims 1 to 4, wherein the charge / discharge control means changes a terminal voltage of the DC capacitor in accordance with characteristics of the motor.   The charge / discharge control means controls the terminal voltage of the DC capacitor to be equal to or higher than the maximum voltage of the fuel cell when the output of the fuel cell is stopped. The fuel cell vehicle control device described in 1.

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